/*
*    Qizx/open 3.0 beta
*
* This code is the open-source version of Qizx.
* Copyright (C) 2004-2009 Axyana Software -- All rights reserved.
*
* The contents of this file are subject to the Mozilla Public License 
*  Version 1.1 (the "License"); you may not use this file except in 
*  compliance with the License. You may obtain a copy of the License at
*  http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
*  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
*  for the specific language governing rights and limitations under the
*  License.
*
* The Initial Developer of the Original Code is Xavier Franc - Axyana Software.
*
*/
using System;
using EvaluationException = System.Qizx.Api.EvaluationException;
using QizxException = System.Qizx.Api.QizxException;
using Comparison = System.Qizx.Util.Basic.Comparison;
using Utils = System.Qizx.Util.Basic.Utils;
using FloatConversion = System.Qizx.Xdm.FloatConversion;
using BaseValue = System.Qizx.XQuery.BaseValue;
using ComparisonContext = System.Qizx.XQuery.ComparisonContext;
using XQItem = System.Qizx.XQuery.XQItem;
using XQType = System.Qizx.XQuery.XQType;
using System.Qizx.XQuery.Fn;

namespace System.Qizx.XQuery.Dt {

    /// <summary>	</summary>
    public class FunctionItem : BaseValue {
        public Prototype prototype;
        public EvalContext lexicalContext;

        private bool started = false;    // single item

        public FunctionItem(Prototype prototype, EvalContext context) {
            this.prototype = prototype;
            this.lexicalContext = context;
            itemType = new FunctionType(prototype);
        }

        public int compareTo(XQItem that, ComparisonContext context, int flags) {
            return Comparison.ERROR;
        }

        public override XQValue BornAgain() {
            return new FunctionItem(prototype, lexicalContext);
        }

        public override bool Next() {
            return started ? false : (started = true);
        }

        public override XQItem Item {
            get {
                return this;
            }
        }

        public String getString() {
            return ToString();
        }

        public override String ToString() {
            return prototype == null ? "function(*)" : prototype.ToString();
        }
    }
}